# Do not allow duplicate Order No. for Same Supplier
**YouTube:** [How to Restrict Duplicate Supplier Order Numbers in Purchase Orders?](https://youtu.be/ZbzREFv1w0o)
## How to Restrict Duplicate Supplier Order Numbers in Purchase Orders?
This tutorial explains how to prevent entering **duplicate Supplier Order Numbers** for the same supplier in Purchase Orders in Logic ERP. This validation ensures every supplier order reference remains unique, improving accuracy and tracking.
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### **Objective of This Feature**
* Prevent duplicate **Supplier Order Numbers**
* Maintain unique supplier references
* Avoid confusion in order tracking
* Improve data accuracy and control
***
### **Create Initial Purchase Order (Default Behavior)**
**Process**
* Open **Purchase Order Module**
* Select **Supplier**
* Go to **Other Details**
* Enter **Supplier Order Number**
**Next Steps**
* Proceed to **Item Details Section**
* Enter items and **Save** the Purchase Order
> **Note:** The system currently allows duplicate Supplier Order Numbers. To restrict this, follow the steps below.
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#### **Enable Duplicate Restriction**
* Open **Configuration Window**
* Go to **Other Settings**
* Locate and enable the option labeled as:
> **“Do not allow duplicate Supp. Order No. for Same Supplier”**
* Click **OK** to apply changes.
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### **Implement in New Purchase Order**
**Transaction Process**
* Start a **New Purchase Order Entry**
* Select the **Same Supplier**
**Enter Duplicate Supplier Order Number**
* Go to **Other Details**
* Enter the **same Supplier Order Number** used earlier
**Next**
* Proceed to **Item Details Section**
* Enter item details
**System Validation**
* While saving, system **restricts the entry**
* Displays alert message:
* *Supplier Order Number already exists for the same supplier*
**Correct Action**
* Modify the **Supplier Order Number**
* Enter a **unique value**
**Result**
* Purchase Order is successfully saved
***
### **Key Benefits**
* Ensures unique supplier order tracking
* Prevents duplicate entries
* Improves record accuracy
* Enhances audit and reporting clarity
***
### **Best Practice Tips**
* Always follow a structured numbering system
* Avoid reusing supplier order references
* Train users to verify before entry
***
### **Final Outcome**
* Duplicate Supplier Order Numbers are restricted
* Each supplier order remains unique
* Better control and accuracy in Purchase Orders
* Improved efficiency and data reliability
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